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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '773b248c8a78930a1ecd18e437ea1e0f6583419117b3821d95486a877e75fa91' 
  AND token = 'in1NhzHw9ZK19U1ED4zwoddokYTCPKv1tfy+HBCj2Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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