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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67d5e3597e9e70df591ef030adecd6e06c78efcf557bb939a60a802c8773b91b' 
  AND token = 'd8df0mUOSLMRm9E+Cn794h5gGjzg4Z4CDOwLNFLE5z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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