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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0ee879d30b5bf5e0b3ff2d0837cf0bd841ca89d90d199cc15e35236e41901c4' 
  AND token = 'qEsoIHwV9BNoS8u+2DxFvcwMwOwRKg7aHt3H/bHBA60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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