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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ffa107d9a0e00f0bebc04c2cbd491863b16ec4a1dbf7412117719344c80b8f5c' 
  AND token = 'eI8aFphbabo9TI8xlVLJhleKnmuYtGRKq+tDf8vW2T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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