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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe56880f3289ffd5791ecc35034d68fb5c74966db4f23e523fc7026fd7f23900' 
  AND token = 'PL3aangdc3WeFi8YJK7vaHMsKATuCdroWnImYBECeL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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