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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cc7c432f49a00e9793c1f964a8e7c8c430fcadc8e221ec57f2532e1a372bfd8' 
  AND token = 'O9Z6v1uUhWpqj7Qy8JnLW39qmHGCJxoQ3+vEoCMePo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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