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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e4430aa897eb358a9c4e2dfcb195dd63ea8f8769e0458bb40a805eae1458cd7' 
  AND token = '9fc9L/JpMiHSEEyou9xMZ1UNKFshxAvQqDFluo8K/a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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