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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02a5684b6451c6aebcda11d640013b9d2682b2893c349b2a66b0b4a8e3498b3e' 
  AND token = 'XXHsbKBFo08c2zARlQAtEX8TZMLv6OT68p6f3pDl4TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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