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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc7ce62f641261788277b339150c72c17883c69c1d768e3a8d40df48f8a8ea0c' 
  AND token = 'w/X+cjGWf2Ec2whIduy+nTfJuLlc0zypDWRB0gcdXyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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