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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c3c21defa00fde3b2d2bda1902430146824f4108c08a6cad3128d85d7026376' 
  AND token = 'm5hjtzBSiuMbTJPb0IJ6oSgvanNzhoH0HDF9rYjDvvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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