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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac17a16872e4d4961b8977498a775facb0cf0f1c53c6584db3d9c06d1fee5557' 
  AND token = 'SuvD1pSbWm66dzJSPToo6V0QHM1b0a042AkTl1dq0a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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