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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a747f1a91d7ffe8a028d51daaf81d7a0b787d2ef6d3fcf67699408c610f54855' 
  AND token = '55Y0GKpa3dfJuWCzJ5FfhXjfH+3lSPapsgP0lvC4zx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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