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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bc6571857fa414d5452aaabac3c8a9c1a4dc2751253b5ee4023ac085f91ea830' 
  AND token = '7AwZo1cx/KCgZLHqslYAG+ssC1yIY9/J5zatP4RgSE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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