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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c70491c175940bb1c907b49f96f166172c66d12d13e53a351805f02c02ee5867' 
  AND token = 'Ki3C5yEqsK3oh4/xt9yioxetFMqdqyBvnRELInJFLlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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