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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b9c98dbbd14059690a9cfbcb8403bd568c28b56b15735cdd3f1ab2289ab4df3' 
  AND token = '98MYQP70ItL5V2L4bluqN7/UOHBTbyRFvXTWok5ygss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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