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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f2abf2aef8f35a2870d3ab2d1f25b70fb860ebc77d27d3f76834496e46a4dc9' 
  AND token = 'X8onlLlqA4gzq1CMA1Id6nrzUr65MyZ/xV20FulAv9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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