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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d36423b26db3ab6b96326b08d26332690cf4a37fe0c8613dc3e58a706fe2179' 
  AND token = 'JxOEjvkLbBIPMCv1Qx2A0d6cRaaLJ+Q/4cq0ee6EbCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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