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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76ca55efc9736177ac3b83caabcac558785c230bd0b3a97f162ed51000bdea76' 
  AND token = '9BABK2cRrhHez84g+mg851bXFuFawrvOoL+Bh0FM9e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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