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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '983385ef56ef797911908d0f80052ea34ceb4bbf14849e3840e98be46939e65e' 
  AND token = 'pQ852M/QKYbVT8mOMq9n3+nPJvipGSHgSb8KZBDYef8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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