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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8418fff594e7df9c0a0dcd8fd0a1773e886bf2815d0f897ecc8924318a72c52' 
  AND token = 'O0MiV0E2jB9017wiouwxaJ3b3lt5rXZB3bjsIagNuUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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