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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcfcd93e9bc3ac069a832e2f5a441265189f963cb8ee365d4b04dc0e8f83dd21' 
  AND token = 'WUypykdobVu3202gb0r5FBdY7zOQR9WzUIn6DshmjGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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