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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd020052b57ba537f7e1f754b2a54cd6d8b11cad60aad9baccde0ce7b8780fc12' 
  AND token = 'CpxwCVHRPNTiF+rOl1Gr9axsB+fUoVY1ALsh98+02Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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