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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f07b0973984ee1ed63c6ca76d5acc0f71276c45a31639ceb50133812e69b91da' 
  AND token = 'o5UVl+IX0cr3E8xlPpd2IkCgnCowmzSZcyn08cMsnkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}