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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c816a90499918b0d4be24b3e71bf13bd6d52c332c2d37d5efe5328f220f2817' 
  AND token = 'EyikKSXPbX7e+gc1hY5pvMOfGlVzEzM08UdWRRW1wMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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