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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2f97f6a27764e81c5c0224e40a3fcabf98ce112649413c8218d4841271ba5fd' 
  AND token = 'lWfck/FC963gwvaz+3joys2g6uOkLhkXh9URSRaC4Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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