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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82b2010a1b7c60eb8609cab452d5a170c9f6741f03e3accaa748b74168459977' 
  AND token = 'ZT0bKtFKrJPe8sh9+kHaO9AwX7PS21nznHobqSlN6x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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