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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f998b0e4491a938d5d1fc8a1ff86802a0a6a426e0e8fcd44e999f71af039fa3' 
  AND token = '78ZBENh3aBBfnhECZ066BLfaMkNnyx8Z+3Ns/d54XCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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