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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2af2025a8f49c7e86bf9642e95a42b0a69e0cedbbf75bc2c312233ce434a4e36' 
  AND token = 'CoDgN8N5ewln/klzpWNItC+hsazUaMqLPXpCaGj7vgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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