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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '841beafb6506fef43540de031d360ef8325ee9030e7a7bd7cd6e07d23c7420ff' 
  AND token = 'gmicK8zI4oCEhWhozGTMYIDGAmiieEE0UqWe0XCws2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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