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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9b49332fe54725aa5ef45b9e350236e3f4e607c8e26c11ab170d98da488c4b3' 
  AND token = 'bb3Q69l0dkDVIuZT1Vy/Tufe8mUbFEz1KDmmuVDulV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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