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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '895b9e14b71fd68f814b9d783838c4c8481813bb84d4dc6e8d02239ea931e60b' 
  AND token = '6hL7f5KG8KY2AX1rPNkbH1N8cbMDQcFJ3gfvNcgAahA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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