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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4cb1e2f05659c70f12721219496762aaeed2c4746d6bb043079e451a90df847' 
  AND token = 'IgncuDIzgX49DsPtzYRI1JVJpKa7sm3ib/W6m/daPi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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