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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '304a910ecb9268fa8a996320792940bf195b5b81bb068bbb9f833ce434e51727' 
  AND token = 'nhdKUu78fSy5D9wCn7Pnni4fAOPaBI8842ynAHu6a2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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