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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a46f902ff04ba389eba3cd5e87150d926ab0ad7e8bba72ff453e2ba766d84f60' 
  AND token = 'TAV+tZA4uO3aR7m6wb9yRrWHV/netn6CArsSzvSQBas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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