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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '751ea7c1f13bb0ac19ac131708ff8f1917229e0ec2bbaafaed97e6dda62b5df3' 
  AND token = 'mF2pPvYMrWHbRC8US5UrsM47viYtoETJcpa3Z5A4Xoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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