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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33fb5a1906be26e87028b2abf82079d92432138d810b574554169fb511abe041' 
  AND token = 'tIIp8keiKUlxtSQ5Sf2fIYAA9ms9+Wzd2Xnn5/EqgNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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