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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e4d98ccdaf72f1a040309036d38ebcd1e1b9869c875b114c72d49c8033eb9ae' 
  AND token = 'L4SRmM2q5pE2Xy5/pEZW7cJi8PTteZADkHiazL2IhVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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