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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfa3df2259e0e905c999867ab8b6bae65bcbdeed46663e1bf05df5af899b37e3' 
  AND token = '3+JaM2BqAPHHT/t8Uvw9taOwx/9NzMlPgSAXZB2rzeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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